package org.dong.proto.webapp.core;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.dong.proto.core.constants.OSConstants;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

public class PermissionInterceptor implements HandlerInterceptor{
	  
	    /** 
	     * 在业务处理器处理请求之前被调用 
	     * 如果返回false 
	     *     从当前的拦截器往回执行所有拦截器的afterCompletion(),再退出拦截器链 
	     *  
	     * 如果返回true 
	     *    执行下一个拦截器,直到所有的拦截器都执行完毕 
	     *    再执行被拦截的Controller 
	     *    然后进入拦截器链, 
	     *    从最后一个拦截器往回执行所有的postHandle() 
	     *    接着再从最后一个拦截器往回执行所有的afterCompletion() 
	     */  
	    @Override  
	    public boolean preHandle(HttpServletRequest request,  
	            HttpServletResponse response, Object handler) throws Exception {  
	        // TODO Auto-generated method stub  
//	        log.info("==============执行顺序: 1、preHandle================");  
	        
	        String requesturi = request.getRequestURI();
			if (
					null == request.getSession().getAttribute(OSConstants.SESSION_KEY_USER) 
					&& !requesturi.endsWith("/randCode/back") 
					&& !requesturi.endsWith(".js") 
					&& !requesturi.endsWith(".css") 
					&& !requesturi.endsWith(".png") 
					&& !requesturi.endsWith(".jpg") 
					&& !requesturi.endsWith("/back/login") 
					&& !requesturi.endsWith("/login/back") 
					) {
				
				response.sendRedirect(request.getContextPath()+ "/back/login");
				 return false;
			}
	        
	        return true;  
	    }  
	  
	    //在业务处理器处理请求执行完成后,生成视图之前执行的动作   
	    @Override  
	    public void postHandle(HttpServletRequest request,  
	            HttpServletResponse response, Object handler,  
	            ModelAndView modelAndView) throws Exception {  
	        // TODO Auto-generated method stub  
//	        log.info("==============执行顺序: 2、postHandle================");  
	    }  
	  
	    /** 
	     * 在DispatcherServlet完全处理完请求后被调用  
	     *  
	     *   当有拦截器抛出异常时,会从当前拦截器往回执行所有的拦截器的afterCompletion() 
	     */  
	    @Override  
	    public void afterCompletion(HttpServletRequest request,  
	            HttpServletResponse response, Object handler, Exception ex)  
	            throws Exception {  
	        // TODO Auto-generated method stub  
//	        log.info("==============执行顺序: 3、afterCompletion================");  
	    }  
}
